Why do you care? The hippocampus is the brain region critical to long-term memory.

Another point from the study – those who did aerobic exercise also had higher levels of proteins to help build new neurons.

More research is starting to suggest that exercise earlier in life could act as a protective barrier against disease and brain atrophy later in life. It’s in your brain’s best interest to start the exercise habit early. [Kirk Erickson, coauthor of the paper and professor at the University of Pittsburgh – from Experience Life magazine]